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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Peter Anvin: - Three EFI-related fixes - Two early memory initialization fixes - build fix for older binutils - fix for an eager FPU performance regression -- currently we don't allow the use of the FPU at interrupt time *at all* in eager mode, which is clearly wrong. * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86: Allow FPU to be used at interrupt time even with eagerfpu x86, crc32-pclmul: Fix build with older binutils x86-64, init: Fix a possible wraparound bug in switchover in head_64.S x86, range: fix missing merge during add range x86, efi: initial the local variable of DataSize to zero efivar: fix oops in efivar_update_sysfs_entries() caused by memory reuse efivarfs: Never return ENOENT from firmware again
This commit is contained in:
Linus Torvalds
commit
484b002e28
@ -240,7 +240,7 @@ fold_64:
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pand %xmm3, %xmm1
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PCLMULQDQ 0x00, CONSTANT, %xmm1
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pxor %xmm2, %xmm1
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pextrd $0x01, %xmm1, %eax
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PEXTRD 0x01, %xmm1, %eax
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ret
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ENDPROC(crc32_pclmul_le_16)
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@ -9,12 +9,68 @@
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#define REG_NUM_INVALID 100
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#define REG_TYPE_R64 0
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#define REG_TYPE_XMM 1
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#define REG_TYPE_R32 0
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#define REG_TYPE_R64 1
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#define REG_TYPE_XMM 2
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#define REG_TYPE_INVALID 100
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.macro R32_NUM opd r32
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\opd = REG_NUM_INVALID
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.ifc \r32,%eax
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\opd = 0
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.endif
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.ifc \r32,%ecx
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\opd = 1
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.endif
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.ifc \r32,%edx
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\opd = 2
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.endif
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.ifc \r32,%ebx
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\opd = 3
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.endif
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.ifc \r32,%esp
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\opd = 4
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.endif
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.ifc \r32,%ebp
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\opd = 5
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.endif
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.ifc \r32,%esi
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\opd = 6
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.endif
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.ifc \r32,%edi
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\opd = 7
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.endif
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#ifdef CONFIG_X86_64
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.ifc \r32,%r8d
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\opd = 8
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.endif
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.ifc \r32,%r9d
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\opd = 9
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.endif
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.ifc \r32,%r10d
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\opd = 10
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.endif
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.ifc \r32,%r11d
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\opd = 11
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.endif
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.ifc \r32,%r12d
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\opd = 12
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.endif
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.ifc \r32,%r13d
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\opd = 13
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.endif
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.ifc \r32,%r14d
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\opd = 14
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.endif
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.ifc \r32,%r15d
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\opd = 15
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.endif
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#endif
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.endm
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.macro R64_NUM opd r64
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\opd = REG_NUM_INVALID
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#ifdef CONFIG_X86_64
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.ifc \r64,%rax
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\opd = 0
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.endif
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@ -63,6 +119,7 @@
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.ifc \r64,%r15
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\opd = 15
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.endif
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#endif
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.endm
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.macro XMM_NUM opd xmm
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@ -118,10 +175,13 @@
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.endm
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.macro REG_TYPE type reg
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R32_NUM reg_type_r32 \reg
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R64_NUM reg_type_r64 \reg
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XMM_NUM reg_type_xmm \reg
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.if reg_type_r64 <> REG_NUM_INVALID
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\type = REG_TYPE_R64
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.elseif reg_type_r32 <> REG_NUM_INVALID
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\type = REG_TYPE_R32
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.elseif reg_type_xmm <> REG_NUM_INVALID
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\type = REG_TYPE_XMM
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.else
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@ -162,6 +222,16 @@
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.byte \imm8
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.endm
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.macro PEXTRD imm8 xmm gpr
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R32_NUM extrd_opd1 \gpr
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XMM_NUM extrd_opd2 \xmm
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PFX_OPD_SIZE
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PFX_REX extrd_opd1 extrd_opd2
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.byte 0x0f, 0x3a, 0x16
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MODRM 0xc0 extrd_opd1 extrd_opd2
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.byte \imm8
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.endm
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.macro AESKEYGENASSIST rcon xmm1 xmm2
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XMM_NUM aeskeygen_opd1 \xmm1
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XMM_NUM aeskeygen_opd2 \xmm2
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@ -115,8 +115,10 @@ startup_64:
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movq %rdi, %rax
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shrq $PUD_SHIFT, %rax
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andl $(PTRS_PER_PUD-1), %eax
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movq %rdx, (4096+0)(%rbx,%rax,8)
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movq %rdx, (4096+8)(%rbx,%rax,8)
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movq %rdx, 4096(%rbx,%rax,8)
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incl %eax
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andl $(PTRS_PER_PUD-1), %eax
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movq %rdx, 4096(%rbx,%rax,8)
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addq $8192, %rbx
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movq %rdi, %rax
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@ -22,23 +22,19 @@
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/*
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* Were we in an interrupt that interrupted kernel mode?
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*
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* For now, with eagerfpu we will return interrupted kernel FPU
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* state as not-idle. TBD: Ideally we can change the return value
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* to something like __thread_has_fpu(current). But we need to
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* be careful of doing __thread_clear_has_fpu() before saving
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* the FPU etc for supporting nested uses etc. For now, take
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* the simple route!
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*
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* On others, we can do a kernel_fpu_begin/end() pair *ONLY* if that
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* pair does nothing at all: the thread must not have fpu (so
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* that we don't try to save the FPU state), and TS must
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* be set (so that the clts/stts pair does nothing that is
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* visible in the interrupted kernel thread).
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*
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* Except for the eagerfpu case when we return 1 unless we've already
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* been eager and saved the state in kernel_fpu_begin().
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*/
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static inline bool interrupted_kernel_fpu_idle(void)
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{
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if (use_eager_fpu())
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return 0;
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return __thread_has_fpu(current);
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return !__thread_has_fpu(current) &&
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(read_cr0() & X86_CR0_TS);
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@ -78,8 +74,8 @@ void __kernel_fpu_begin(void)
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struct task_struct *me = current;
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if (__thread_has_fpu(me)) {
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__save_init_fpu(me);
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__thread_clear_has_fpu(me);
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__save_init_fpu(me);
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/* We do 'stts()' in __kernel_fpu_end() */
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} else if (!use_eager_fpu()) {
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this_cpu_write(fpu_owner_task, NULL);
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@ -206,7 +206,7 @@ static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
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}
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if (boot_used_size && !finished) {
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unsigned long size;
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unsigned long size = 0;
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u32 attr;
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efi_status_t s;
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void *tmp;
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@ -523,14 +523,12 @@ static void efivar_update_sysfs_entries(struct work_struct *work)
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struct efivar_entry *entry;
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int err;
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/* Add new sysfs entries */
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while (1) {
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entry = kzalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry)
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return;
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/* Add new sysfs entries */
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while (1) {
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memset(entry, 0, sizeof(*entry));
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err = efivar_init(efivar_update_sysfs_entry, entry,
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true, false, &efivar_sysfs_list);
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if (!err)
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@ -44,8 +44,11 @@ static ssize_t efivarfs_file_write(struct file *file,
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bytes = efivar_entry_set_get_size(var, attributes, &datasize,
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data, &set);
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if (!set && bytes)
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if (!set && bytes) {
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if (bytes == -ENOENT)
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bytes = -EIO;
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goto out;
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}
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if (bytes == -ENOENT) {
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drop_nlink(inode);
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@ -76,7 +79,14 @@ static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf,
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int err;
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err = efivar_entry_size(var, &datasize);
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if (err)
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/*
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* efivarfs represents uncommitted variables with
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* zero-length files. Reading them should return EOF.
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*/
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if (err == -ENOENT)
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return 0;
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else if (err)
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return err;
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data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL);
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@ -48,9 +48,11 @@ int add_range_with_merge(struct range *range, int az, int nr_range,
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final_start = min(range[i].start, start);
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final_end = max(range[i].end, end);
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range[i].start = final_start;
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range[i].end = final_end;
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return nr_range;
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/* clear it and add it back for further merge */
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range[i].start = 0;
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range[i].end = 0;
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return add_range_with_merge(range, az, nr_range,
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final_start, final_end);
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}
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/* Need to add it: */
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