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arm64 fixes for -rc1

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- Remove some redundant Kconfig conditionals
 
 - Fix string output in ptrace selftest
 
 - Fix fast GUP crashes in some page-table configurations
 
 - Remove obsolete linker option when building the vDSO
 
 - Fix some sysreg field definitions for the GIC
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fixes from Will Deacon:
 "The usual summary below, but the main fix is for the fast GUP lockless
  page-table walk when we have a combination of compile-time and
  run-time folding of the p4d and the pud respectively.

   - Remove some redundant Kconfig conditionals

   - Fix string output in ptrace selftest

   - Fix fast GUP crashes in some page-table configurations

   - Remove obsolete linker option when building the vDSO

   - Fix some sysreg field definitions for the GIC"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: mm: Fix lockless walks with static and dynamic page-table folding
  arm64/sysreg: Correct the values for GICv4.1
  arm64/vdso: Remove --hash-style=sysv
  kselftest: missing arg in ptrace.c
  arm64/Kconfig: Remove redundant 'if HAVE_FUNCTION_GRAPH_TRACER'
  arm64: remove redundant 'if HAVE_ARCH_KASAN' in Kconfig
This commit is contained in:
Linus Torvalds 2024-07-26 10:39:10 -07:00
commit a6294b5b1f
6 changed files with 31 additions and 9 deletions
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8
arch/arm64/Kconfig
View File

@ -168,9 +168,9 @@ config ARM64
select HAVE_ARCH_JUMP_LABEL
select HAVE_ARCH_JUMP_LABEL_RELATIVE
select HAVE_ARCH_KASAN
select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
select HAVE_ARCH_KASAN_SW_TAGS if HAVE_ARCH_KASAN
select HAVE_ARCH_KASAN_HW_TAGS if (HAVE_ARCH_KASAN && ARM64_MTE)
select HAVE_ARCH_KASAN_VMALLOC
select HAVE_ARCH_KASAN_SW_TAGS
select HAVE_ARCH_KASAN_HW_TAGS if ARM64_MTE
# Some instrumentation may be unsound, hence EXPERT
select HAVE_ARCH_KCSAN if EXPERT
select HAVE_ARCH_KFENCE
@ -211,8 +211,8 @@ config ARM64
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_GRAPH_RETVAL
select HAVE_GCC_PLUGINS
select HAVE_HARDLOCKUP_DETECTOR_PERF if PERF_EVENTS && \
HW_PERF_EVENTS && HAVE_PERF_EVENTS_NMI

22
arch/arm64/include/asm/pgtable.h
View File

@ -1065,6 +1065,28 @@ static inline bool pgtable_l5_enabled(void) { return false; }
#define p4d_offset_kimg(dir,addr) ((p4d_t *)dir)
static inline
p4d_t *p4d_offset_lockless_folded(pgd_t *pgdp, pgd_t pgd, unsigned long addr)
{
/*
* With runtime folding of the pud, pud_offset_lockless() passes
* the 'pgd_t *' we return here to p4d_to_folded_pud(), which
* will offset the pointer assuming that it points into
* a page-table page. However, the fast GUP path passes us a
* pgd_t allocated on the stack and so we must use the original
* pointer in 'pgdp' to construct the p4d pointer instead of
* using the generic p4d_offset_lockless() implementation.
*
* Note: reusing the original pointer means that we may
* dereference the same (live) page-table entry multiple times.
* This is safe because it is still only loaded once in the
* context of each level and the CPU guarantees same-address
* read-after-read ordering.
*/
return p4d_offset(pgdp, addr);
}
#define p4d_offset_lockless p4d_offset_lockless_folded
#endif /* CONFIG_PGTABLE_LEVELS > 4 */
#define pgd_ERROR(e) \

2
arch/arm64/kernel/vdso/Makefile
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@ -21,7 +21,7 @@ btildflags-$(CONFIG_ARM64_BTI_KERNEL) += -z force-bti
# potential future proofing if we end up with internal calls to the exported
# routines, as x86 does (see 6f121e548f83 ("x86, vdso: Reimplement vdso.so
# preparation in build-time C")).
ldflags-y := -shared -soname=linux-vdso.so.1 --hash-style=sysv \
ldflags-y := -shared -soname=linux-vdso.so.1 \
-Bsymbolic --build-id=sha1 -n $(btildflags-y)
ifdef CONFIG_LD_ORPHAN_WARN

2
arch/arm64/kernel/vdso32/Makefile
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@ -98,7 +98,7 @@ VDSO_AFLAGS += -D__ASSEMBLY__
# From arm vDSO Makefile
VDSO_LDFLAGS += -Bsymbolic --no-undefined -soname=linux-vdso.so.1
VDSO_LDFLAGS += -z max-page-size=4096 -z common-page-size=4096
VDSO_LDFLAGS += -shared --hash-style=sysv --build-id=sha1
VDSO_LDFLAGS += -shared --build-id=sha1
VDSO_LDFLAGS += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)

4
arch/arm64/tools/sysreg
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@ -149,7 +149,7 @@ Res0 63:32
UnsignedEnum 31:28 GIC
0b0000 NI
0b0001 GICv3
0b0010 GICv4p1
0b0011 GICv4p1
EndEnum
UnsignedEnum 27:24 Virt_frac
0b0000 NI
@ -903,7 +903,7 @@ EndEnum
UnsignedEnum 27:24 GIC
0b0000 NI
0b0001 IMP
0b0010 V4P1
0b0011 V4P1
EndEnum
SignedEnum 23:20 AdvSIMD
0b0000 IMP

2
tools/testing/selftests/arm64/abi/ptrace.c
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@ -156,7 +156,7 @@ static void test_hw_debug(pid_t child, int type, const char *type_name)
/* Zero is not currently architecturally valid */
ksft_test_result(arch, "%s_arch_set\n", type_name);
} else {
ksft_test_result_skip("%s_arch_set\n");
ksft_test_result_skip("%s_arch_set\n", type_name);
}
}