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gcov: fix clang-11+ support 

LLVM changed the expected function signatures for llvm_gcda_start_file()
and llvm_gcda_emit_function() in the clang-11 release.  Users of
clang-11 or newer may have noticed their kernels failing to boot due to
a panic when enabling CONFIG_GCOV_KERNEL=y +CONFIG_GCOV_PROFILE_ALL=y.
Fix up the function signatures so calling these functions doesn't panic
the kernel.

Link: https://reviews.llvm.org/rGcdd683b516d147925212724b09ec6fb792a40041
Link: https://reviews.llvm.org/rG13a633b438b6500ecad9e4f936ebadf3411d0f44
Link: https://lkml.kernel.org/r/20210312224132.3413602-2-ndesaulniers@google.com
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reported-by: Prasad Sodagudi <psodagud@quicinc.com>
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Fangrui Song <maskray@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Cc: <stable@vger.kernel.org>	[5.4+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Desaulniers 2021-03-24 21:37:44 -07:00 committed by Linus Torvalds
parent 95d44a470a
commit 60bcf728ee
1 changed files with 69 additions and 0 deletions
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69
kernel/gcov/clang.c
View File

@ -75,7 +75,9 @@ struct gcov_fn_info {
u32 num_counters;
u64 *counters;
#if CONFIG_CLANG_VERSION < 110000
const char *function_name;
#endif
};
static struct gcov_info *current_info;
@ -105,6 +107,7 @@ void llvm_gcov_init(llvm_gcov_callback writeout, llvm_gcov_callback flush)
}
EXPORT_SYMBOL(llvm_gcov_init);
#if CONFIG_CLANG_VERSION < 110000
void llvm_gcda_start_file(const char *orig_filename, const char version[4],
u32 checksum)
{
@ -113,7 +116,17 @@ void llvm_gcda_start_file(const char *orig_filename, const char version[4],
current_info->checksum = checksum;
}
EXPORT_SYMBOL(llvm_gcda_start_file);
#else
void llvm_gcda_start_file(const char *orig_filename, u32 version, u32 checksum)
{
current_info->filename = orig_filename;
current_info->version = version;
current_info->checksum = checksum;
}
EXPORT_SYMBOL(llvm_gcda_start_file);
#endif
#if CONFIG_CLANG_VERSION < 110000
void llvm_gcda_emit_function(u32 ident, const char *function_name,
u32 func_checksum, u8 use_extra_checksum, u32 cfg_checksum)
{
@ -133,6 +146,24 @@ void llvm_gcda_emit_function(u32 ident, const char *function_name,
list_add_tail(&info->head, &current_info->functions);
}
EXPORT_SYMBOL(llvm_gcda_emit_function);
#else
void llvm_gcda_emit_function(u32 ident, u32 func_checksum,
u8 use_extra_checksum, u32 cfg_checksum)
{
struct gcov_fn_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return;
INIT_LIST_HEAD(&info->head);
info->ident = ident;
info->checksum = func_checksum;
info->use_extra_checksum = use_extra_checksum;
info->cfg_checksum = cfg_checksum;
list_add_tail(&info->head, &current_info->functions);
}
EXPORT_SYMBOL(llvm_gcda_emit_function);
#endif
void llvm_gcda_emit_arcs(u32 num_counters, u64 *counters)
{
@ -295,6 +326,7 @@ void gcov_info_add(struct gcov_info *dst, struct gcov_info *src)
}
}
#if CONFIG_CLANG_VERSION < 110000
static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
{
size_t cv_size; /* counter values size */
@ -322,6 +354,28 @@ static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
kfree(fn_dup);
return NULL;
}
#else
static struct gcov_fn_info *gcov_fn_info_dup(struct gcov_fn_info *fn)
{
size_t cv_size; /* counter values size */
struct gcov_fn_info *fn_dup = kmemdup(fn, sizeof(*fn),
GFP_KERNEL);
if (!fn_dup)
return NULL;
INIT_LIST_HEAD(&fn_dup->head);
cv_size = fn->num_counters * sizeof(fn->counters[0]);
fn_dup->counters = vmalloc(cv_size);
if (!fn_dup->counters) {
kfree(fn_dup);
return NULL;
}
memcpy(fn_dup->counters, fn->counters, cv_size);
return fn_dup;
}
#endif
/**
* gcov_info_dup - duplicate profiling data set
@ -362,6 +416,7 @@ struct gcov_info *gcov_info_dup(struct gcov_info *info)
* gcov_info_free - release memory for profiling data set duplicate
* @info: profiling data set duplicate to free
*/
#if CONFIG_CLANG_VERSION < 110000
void gcov_info_free(struct gcov_info *info)
{
struct gcov_fn_info *fn, *tmp;
@ -375,6 +430,20 @@ void gcov_info_free(struct gcov_info *info)
kfree(info->filename);
kfree(info);
}
#else
void gcov_info_free(struct gcov_info *info)
{
struct gcov_fn_info *fn, *tmp;
list_for_each_entry_safe(fn, tmp, &info->functions, head) {
vfree(fn->counters);
list_del(&fn->head);
kfree(fn);
}
kfree(info->filename);
kfree(info);
}
#endif
#define ITER_STRIDE PAGE_SIZE