eed5fae005
The code relies on constant folding of cpu_has_feature() based
on possible and always true values as defined per
CPU_FTRS_ALWAYS and CPU_FTRS_POSSIBLE.
Build failure is encountered with for instance
book3e_all_defconfig on kisskb in the AMDGPU driver which uses
cpu_has_feature(CPU_FTR_VSX_COMP) to decide whether calling
kernel_enable_vsx() or not.
The failure is due to cpu_has_feature() not being inlined with
that configuration with gcc 4.9.
In the same way as commit acdad8fb4a15 ("powerpc: Force inlining of
mmu_has_feature to fix build failure"), for inlining of
cpu_has_feature().
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b231dfa040ce4cc37f702f5c3a595fdeabfe0462.1615378209.git.christophe.leroy@csgroup.eu
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __ASM_POWERPC_CPU_HAS_FEATURE_H
|
|
#define __ASM_POWERPC_CPU_HAS_FEATURE_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/bug.h>
|
|
#include <asm/cputable.h>
|
|
|
|
static __always_inline bool early_cpu_has_feature(unsigned long feature)
|
|
{
|
|
return !!((CPU_FTRS_ALWAYS & feature) ||
|
|
(CPU_FTRS_POSSIBLE & cur_cpu_spec->cpu_features & feature));
|
|
}
|
|
|
|
#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
|
|
#include <linux/jump_label.h>
|
|
|
|
#define NUM_CPU_FTR_KEYS BITS_PER_LONG
|
|
|
|
extern struct static_key_true cpu_feature_keys[NUM_CPU_FTR_KEYS];
|
|
|
|
static __always_inline bool cpu_has_feature(unsigned long feature)
|
|
{
|
|
int i;
|
|
|
|
#ifndef __clang__ /* clang can't cope with this */
|
|
BUILD_BUG_ON(!__builtin_constant_p(feature));
|
|
#endif
|
|
|
|
#ifdef CONFIG_JUMP_LABEL_FEATURE_CHECK_DEBUG
|
|
if (!static_key_initialized) {
|
|
printk("Warning! cpu_has_feature() used prior to jump label init!\n");
|
|
dump_stack();
|
|
return early_cpu_has_feature(feature);
|
|
}
|
|
#endif
|
|
|
|
if (CPU_FTRS_ALWAYS & feature)
|
|
return true;
|
|
|
|
if (!(CPU_FTRS_POSSIBLE & feature))
|
|
return false;
|
|
|
|
i = __builtin_ctzl(feature);
|
|
return static_branch_likely(&cpu_feature_keys[i]);
|
|
}
|
|
#else
|
|
static __always_inline bool cpu_has_feature(unsigned long feature)
|
|
{
|
|
return early_cpu_has_feature(feature);
|
|
}
|
|
#endif
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
#endif /* __ASM_POWERPC_CPU_HAS_FEATURE_H */
|