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- Add a "make x86_debug.config" target which enables a bunch of useful

Browse Source 
config debug options when trying to debug an issue
 
 - A gcc12 build warnings fix
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Merge tag 'x86_build_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 build updates from Borislav Petkov:

 - Add a "make x86_debug.config" target which enables a bunch of useful
   config debug options when trying to debug an issue

 - A gcc-12 build warnings fix

* tag 'x86_build_for_v5.19_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/boot: Wrap literal addresses in absolute_pointer()
  x86/configs: Add x86 debugging Kconfig fragment plus docs
This commit is contained in:
Linus Torvalds 2022-05-23 18:15:44 -07:00
commit 1de564b8c1
5 changed files with 58 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
Documentation/process/maintainer-tip.rst
View File

@ -437,6 +437,20 @@ in a private repository which allows interested people to easily pull the
series for testing. The usual way to offer this is a git URL in the cover
letter of the patch series.
Testing
^^^^^^^
Code should be tested before submitting to the tip maintainers. Anything
other than minor changes should be built, booted and tested with
comprehensive (and heavyweight) kernel debugging options enabled.
These debugging options can be found in kernel/configs/x86_debug.config
and can be added to an existing kernel config by running:
make x86_debug.config
Some of these options are x86-specific and can be left out when testing
on other architectures.
Coding style notes
------------------

1
arch/x86/Makefile
View File

@ -313,5 +313,6 @@ define archhelp
echo ''
echo ' kvm_guest.config - Enable Kconfig items for running this kernel as a KVM guest'
echo ' xen.config - Enable Kconfig items for running this kernel as a Xen guest'
echo ' x86_debug.config - Enable tip tree debugging options for testing'
endef

36
arch/x86/boot/boot.h
View File

@ -77,66 +77,78 @@ typedef unsigned int addr_t;
static inline u8 rdfs8(addr_t addr)
{
u8 *ptr = (u8 *)absolute_pointer(addr);
u8 v;
asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
asm volatile("movb %%fs:%1,%0" : "=q" (v) : "m" (*ptr));
return v;
}
static inline u16 rdfs16(addr_t addr)
{
u16 *ptr = (u16 *)absolute_pointer(addr);
u16 v;
asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
asm volatile("movw %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
return v;
}
static inline u32 rdfs32(addr_t addr)
{
u32 *ptr = (u32 *)absolute_pointer(addr);
u32 v;
asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
asm volatile("movl %%fs:%1,%0" : "=r" (v) : "m" (*ptr));
return v;
}
static inline void wrfs8(u8 v, addr_t addr)
{
asm volatile("movb %1,%%fs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
u8 *ptr = (u8 *)absolute_pointer(addr);
asm volatile("movb %1,%%fs:%0" : "+m" (*ptr) : "qi" (v));
}
static inline void wrfs16(u16 v, addr_t addr)
{
asm volatile("movw %1,%%fs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
u16 *ptr = (u16 *)absolute_pointer(addr);
asm volatile("movw %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
}
static inline void wrfs32(u32 v, addr_t addr)
{
asm volatile("movl %1,%%fs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
u32 *ptr = (u32 *)absolute_pointer(addr);
asm volatile("movl %1,%%fs:%0" : "+m" (*ptr) : "ri" (v));
}
static inline u8 rdgs8(addr_t addr)
{
u8 *ptr = (u8 *)absolute_pointer(addr);
u8 v;
asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*(u8 *)addr));
asm volatile("movb %%gs:%1,%0" : "=q" (v) : "m" (*ptr));
return v;
}
static inline u16 rdgs16(addr_t addr)
{
u16 *ptr = (u16 *)absolute_pointer(addr);
u16 v;
asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*(u16 *)addr));
asm volatile("movw %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
return v;
}
static inline u32 rdgs32(addr_t addr)
{
u32 *ptr = (u32 *)absolute_pointer(addr);
u32 v;
asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*(u32 *)addr));
asm volatile("movl %%gs:%1,%0" : "=r" (v) : "m" (*ptr));
return v;
}
static inline void wrgs8(u8 v, addr_t addr)
{
asm volatile("movb %1,%%gs:%0" : "+m" (*(u8 *)addr) : "qi" (v));
u8 *ptr = (u8 *)absolute_pointer(addr);
asm volatile("movb %1,%%gs:%0" : "+m" (*ptr) : "qi" (v));
}
static inline void wrgs16(u16 v, addr_t addr)
{
asm volatile("movw %1,%%gs:%0" : "+m" (*(u16 *)addr) : "ri" (v));
u16 *ptr = (u16 *)absolute_pointer(addr);
asm volatile("movw %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
}
static inline void wrgs32(u32 v, addr_t addr)
{
asm volatile("movl %1,%%gs:%0" : "+m" (*(u32 *)addr) : "ri" (v));
u32 *ptr = (u32 *)absolute_pointer(addr);
asm volatile("movl %1,%%gs:%0" : "+m" (*ptr) : "ri" (v));
}
/* Note: these only return true/false, not a signed return value! */

2
arch/x86/boot/main.c
View File

@ -35,7 +35,7 @@ static void copy_boot_params(void)
u16 cl_offset;
};
const struct old_cmdline * const oldcmd =
(const struct old_cmdline *)OLD_CL_ADDRESS;
absolute_pointer(OLD_CL_ADDRESS);
BUILD_BUG_ON(sizeof(boot_params) != 4096);
memcpy(&boot_params.hdr, &hdr, sizeof(hdr));

18
kernel/configs/x86_debug.config Normal file
View File

@ -0,0 +1,18 @@
CONFIG_X86_DEBUG_FPU=y
CONFIG_LOCK_STAT=y
CONFIG_DEBUG_VM=y
CONFIG_DEBUG_VM_VMACACHE=y
CONFIG_DEBUG_VM_RB=y
CONFIG_DEBUG_SLAB=y
CONFIG_DEBUG_KMEMLEAK=y
CONFIG_DEBUG_PAGEALLOC=y
CONFIG_SLUB_DEBUG_ON=y
CONFIG_KMEMCHECK=y
CONFIG_DEBUG_OBJECTS=y
CONFIG_DEBUG_OBJECTS_ENABLE_DEFAULT=1
CONFIG_GCOV_KERNEL=y
CONFIG_LOCKDEP=y
CONFIG_PROVE_LOCKING=y
CONFIG_SCHEDSTATS=y
CONFIG_VMLINUX_VALIDATION=y
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y