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| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2015-04-01 15:36:57 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-04-02 11:59:43 +0300 |
| commit | fee3fd4fd2ad136b26226346c3f8b446cc120bf5 (patch) | |
| tree | 268dd284a31aa2926112aa0eb1cd28990beb045c /arch/arm/include/asm/smp_plat.h | |
| parent | 045ab94e10ee17038066d71abc8fdce719ab56f9 (diff) | |
| download | linux-fee3fd4fd2ad136b26226346c3f8b446cc120bf5.tar.xz | |
ARM: 8338/1: kexec: Relax SMP validation to improve DT compatibility
When trying to kexec into a new kernel on a platform where multiple CPU
cores are present, but no SMP bringup code is available yet, the
kexec_load system call fails with:
kexec_load failed: Invalid argument
The SMP test added to machine_kexec_prepare() in commit 2103f6cba61a8b8b
("ARM: 7807/1: kexec: validate CPU hotplug support") wants to prohibit
kexec on SMP platforms where it cannot disable secondary CPUs.
However, this test is too strict: if the secondary CPUs couldn't be
enabled in the first place, there's no need to disable them later at
kexec time. Hence skip the test in the absence of SMP bringup code.
This allows to add all CPU cores to the DTS from the beginning, without
having to implement SMP bringup first, improving DT compatibility.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/smp_plat.h')
| -rw-r--r-- | arch/arm/include/asm/smp_plat.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/include/asm/smp_plat.h b/arch/arm/include/asm/smp_plat.h index 0ad7d490ee6f..993e5224d8f7 100644 --- a/arch/arm/include/asm/smp_plat.h +++ b/arch/arm/include/asm/smp_plat.h @@ -104,6 +104,7 @@ static inline u32 mpidr_hash_size(void) return 1 << mpidr_hash.bits; } +extern int platform_can_secondary_boot(void); extern int platform_can_cpu_hotplug(void); #endif |