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- Have invalid MSR accesses warnings appear only once after a

Browse source 
pr_warn_once() change broke that
 
 - Simplify {JMP,CALL}_NOSPEC and let the objtool retpoline patching
 infra take care of them instead of having unreadable alternative macros
 there
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Merge tag 'x86_core_for_v6.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 core updates from Borislav Petkov:

 - Have invalid MSR accesses warnings appear only once after a
   pr_warn_once() change broke that

 - Simplify {JMP,CALL}_NOSPEC and let the objtool retpoline patching
   infra take care of them instead of having unreadable alternative
   macros there

* tag 'x86_core_for_v6.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/extable: Fix ex_handler_msr() print condition
  x86,nospec: Simplify {JMP,CALL}_NOSPEC
This commit is contained in:
Linus Torvalds 2022-08-01 10:04:00 -07:00
commit ecf9b7bfea
3 changed files with 43 additions and 17 deletions
Download patch file Download diff file Expand all files Collapse all files

20
include/linux/once_lite.h
View file

@ -9,15 +9,27 @@
*/
#define DO_ONCE_LITE(func, ...) \
DO_ONCE_LITE_IF(true, func, ##__VA_ARGS__)
#define DO_ONCE_LITE_IF(condition, func, ...) \
#define __ONCE_LITE_IF(condition) \
({ \
static bool __section(".data.once") __already_done; \
bool __ret_cond = !!(condition); \
bool __ret_once = false; \
\
if (unlikely(__ret_cond && !__already_done)) { \
__already_done = true; \
__ret_once = true; \
} \
unlikely(__ret_once); \
})
#define DO_ONCE_LITE_IF(condition, func, ...) \
({ \
bool __ret_do_once = !!(condition); \
\
if (unlikely(__ret_do_once && !__already_done)) { \
__already_done = true; \
if (__ONCE_LITE_IF(__ret_do_once)) \
func(__VA_ARGS__); \
} \
\
unlikely(__ret_do_once); \
})