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arm64: sve: Fix build failure when ARM64_SVE=y and SYSCTL=n

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[ Upstream commit e575fb9e76c8e33440fb859572a8b7d430f053d6 ]

When I squashed the 'allnoconfig' compiler warning about the
set_sve_default_vl() function being defined but not used in commit
1e570f512cbd ("arm64/sve: Eliminate data races on sve_default_vl"), I
accidentally broke the build for configs where ARM64_SVE is enabled, but
SYSCTL is not.

Fix this by only compiling the SVE sysctl support if both CONFIG_SVE=y
and CONFIG_SYSCTL=y.

Cc: Dave Martin <Dave.Martin@arm.com>
Reported-by: Qian Cai <cai@lca.pw>
Link: https://lore.kernel.org/r/20200616131808.GA1040@lca.pw
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Will Deacon 2020-06-16 18:29:11 +01:00 • committed by Sasha Levin
commit cbed4eb0a9
1 changed files with 3 additions and 3 deletions
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6
arch/arm64/kernel/fpsimd.c
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@ -338,7 +338,7 @@ static unsigned int find_supported_vector_length(unsigned int vl)
return sve_vl_from_vq(__bit_to_vq(bit));
}
#ifdef CONFIG_SYSCTL
#if defined(CONFIG_ARM64_SVE) && defined(CONFIG_SYSCTL)
static int sve_proc_do_default_vl(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
@ -384,9 +384,9 @@ static int __init sve_sysctl_init(void)
return 0;
}
#else /* ! CONFIG_SYSCTL */
#else /* ! (CONFIG_ARM64_SVE && CONFIG_SYSCTL) */
static int __init sve_sysctl_init(void) { return 0; }
#endif /* ! CONFIG_SYSCTL */
#endif /* ! (CONFIG_ARM64_SVE && CONFIG_SYSCTL) */
#define ZREG(sve_state, vq, n) ((char *)(sve_state) + \
(SVE_SIG_ZREG_OFFSET(vq, n) - SVE_SIG_REGS_OFFSET))