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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-09-04 09:47:48 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-10-04 19:23:36 (GMT) |
| commit | f00ec48fadf5e37e7889f14cff900aa70d18b644 (patch) | |
| tree | 421cbce97167a78532aa825624f380caade3c0d2 /arch/arm/kernel/vmlinux.lds.S | |
| parent | 067173526c3bbc2eaeefcf6b7b2a9d998b9e8042 (diff) | |
| download | linux-fsl-qoriq-f00ec48fadf5e37e7889f14cff900aa70d18b644.tar.xz | |
ARM: Allow SMP kernels to boot on UP systems
UP systems do not implement all the instructions that SMP systems have,
so in order to boot a SMP kernel on a UP system, we need to rewrite
parts of the kernel.
Do this using an 'alternatives' scheme, where the kernel code and data
is modified prior to initialization to replace the SMP instructions,
thereby rendering the problematical code ineffectual. We use the linker
to generate a list of 32-bit word locations and their replacement values,
and run through these replacements when we detect a UP system.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/vmlinux.lds.S')
| -rw-r--r-- | arch/arm/kernel/vmlinux.lds.S | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/kernel/vmlinux.lds.S b/arch/arm/kernel/vmlinux.lds.S index b16c079..fd5750b 100644 --- a/arch/arm/kernel/vmlinux.lds.S +++ b/arch/arm/kernel/vmlinux.lds.S @@ -40,6 +40,11 @@ SECTIONS __tagtable_begin = .; *(.taglist.init) __tagtable_end = .; +#ifdef CONFIG_SMP_ON_UP + __smpalt_begin = .; + *(.alt.smp.init) + __smpalt_end = .; +#endif INIT_SETUP(16) @@ -237,6 +242,12 @@ SECTIONS /* Default discards */ DISCARDS + +#ifndef CONFIG_SMP_ON_UP + /DISCARD/ : { + *(.alt.smp.init) + } +#endif } /* |