With perf: Simplify find_get_pmu_context() (hash may have changed, check for the most recent core/guards branch):
$ make -skj"$(nproc)" ARCH=powerpc CC=clang CROSS_COMPILE=powerpc-linux-gnu- LLVM_IAS=0 mrproper 44x/akebono_defconfig kernel/events/core.o
kernel/events/core.c:4807:4: error: cannot jump from this asm goto statement to one of its possible targets
4807 | WARN_ON_ONCE(epc->ctx != ctx);
| ^
include/asm-generic/bug.h:113:3: note: expanded from macro 'WARN_ON_ONCE'
113 | __WARN_FLAGS(BUGFLAG_ONCE | \
| ^
arch/powerpc/include/asm/bug.h:101:2: note: expanded from macro '__WARN_FLAGS'
101 | WARN_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags), __label_warn_on); \
| ^
arch/powerpc/include/asm/bug.h:77:2: note: expanded from macro 'WARN_ENTRY'
77 | asm_volatile_goto( \
| ^
include/linux/compiler_types.h:328:33: note: expanded from macro 'asm_volatile_goto'
328 | #define asm_volatile_goto(x...) asm goto(x)
| ^
kernel/events/core.c:4776:4: note: possible target of asm goto statement
4776 | WARN_ON_ONCE(epc->ctx != ctx);
| ^
include/asm-generic/bug.h:113:3: note: expanded from macro 'WARN_ON_ONCE'
113 | __WARN_FLAGS(BUGFLAG_ONCE | \
| ^
arch/powerpc/include/asm/bug.h:104:9: note: expanded from macro '__WARN_FLAGS'
104 | \
| ^
kernel/events/core.c:4783:8: note: jump exits scope of variable with __attribute__((cleanup))
4783 | void *new __free(kfree) = kzalloc(sizeof(*epc), GFP_KERNEL);
| ^
kernel/events/core.c:4776:4: error: cannot jump from this asm goto statement to one of its possible targets
4776 | WARN_ON_ONCE(epc->ctx != ctx);
| ^
include/asm-generic/bug.h:113:3: note: expanded from macro 'WARN_ON_ONCE'
113 | __WARN_FLAGS(BUGFLAG_ONCE | \
| ^
arch/powerpc/include/asm/bug.h:101:2: note: expanded from macro '__WARN_FLAGS'
101 | WARN_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags), __label_warn_on); \
| ^
arch/powerpc/include/asm/bug.h:77:2: note: expanded from macro 'WARN_ENTRY'
77 | asm_volatile_goto( \
| ^
include/linux/compiler_types.h:328:33: note: expanded from macro 'asm_volatile_goto'
328 | #define asm_volatile_goto(x...) asm goto(x)
| ^
kernel/events/core.c:4807:4: note: possible target of asm goto statement
4807 | WARN_ON_ONCE(epc->ctx != ctx);
| ^
include/asm-generic/bug.h:113:3: note: expanded from macro 'WARN_ON_ONCE'
113 | __WARN_FLAGS(BUGFLAG_ONCE | \
| ^
arch/powerpc/include/asm/bug.h:104:9: note: expanded from macro '__WARN_FLAGS'
104 | \
| ^
kernel/events/core.c:4783:8: note: jump bypasses initialization of variable with __attribute__((cleanup))
4783 | void *new __free(kfree) = kzalloc(sizeof(*epc), GFP_KERNEL);
| ^
2 errors generated.
Looking at the preprocessed source, I wonder if something is going sideways with __label_warn_on in __WARN_FLAGS()?
For what it is worth, this code may be killed for an independent reason: https://lore.kernel.org/bb8b901b51f1beaaf9fa86ce8ce9b8191817b3e1.1687539638.git.christophe.leroy@csgroup.eu/
With perf: Simplify find_get_pmu_context() (hash may have changed, check for the most recent
core/guardsbranch):Looking at the preprocessed source, I wonder if something is going sideways with
__label_warn_onin__WARN_FLAGS()?For what it is worth, this code may be killed for an independent reason: https://lore.kernel.org/bb8b901b51f1beaaf9fa86ce8ce9b8191817b3e1.1687539638.git.christophe.leroy@csgroup.eu/