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FROMLIST: vsprintf: Inline call to ptr_to_hashval

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There is concern that ptr_to_hashval not being inlined can cause performance
issues (unlike before where it was a static branch) with trace_printk being a
hot path for it. Just create an inline version called __ptr_to_hashval(), and
have the actual ptr_to_hashval() call it.

Bug: 145972256

Link: http://lore.kernel.org/r/[email protected]
Link: lore.kernel.org/r/[email protected]
Suggested-by: Steven Rostedt <[email protected]>
Change-Id: Ie7133b9f32a8185e244db2634b028b316a3d7ea1
Signed-off-by: Joel Fernandes <[email protected]>
Signed-off-by: Joel Fernandes <[email protected]>
(cherry picked from commit 0f2b4ea6e2356687ce78ff23b8556d2138b6fe28)
This commit is contained in:
Joel Fernandes (Google) 2019-11-18 14:08:03 -05:00 • committed by Joel Fernandes
commit 900e78fa31
1 changed files with 7 additions and 2 deletions
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9
lib/vsprintf.c
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@ -739,7 +739,7 @@ static int __init initialize_ptr_random(void)
}
early_initcall(initialize_ptr_random);
int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
static inline int __ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
{
unsigned long hashval;
@ -760,6 +760,11 @@ int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
return 0;
}
int ptr_to_hashval(const void *ptr, unsigned long *hashval_out)
{
return __ptr_to_hashval(ptr, hashval_out);
}
/* Maps a pointer to a 32 bit unique identifier. */
static char *ptr_to_id(char *buf, char *end, const void *ptr,
struct printf_spec spec)
@ -774,7 +779,7 @@ static char *ptr_to_id(char *buf, char *end, const void *ptr,
return pointer_string(buf, end, (const void *)hashval, spec);
}
ret = ptr_to_hashval(ptr, &hashval);
ret = __ptr_to_hashval(ptr, &hashval);
if (ret) {
spec.field_width = 2 * sizeof(ptr);
/* string length must be less than default_width */