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authorMichael Ellerman <mpe@ellerman.id.au>2016-09-15 15:11:59 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2016-09-19 10:53:56 +1000
commit7de3b27bac47da9de08409df1d69664acbb72197 (patch)
tree34c3d7f43012a3a5a686ce95c7d94d731b0dddb4 /arch/powerpc/kernel/vmlinux.lds.S
parentpowerpc: Don't change the section in _GLOBAL() (diff)
downloadlinux-dev-7de3b27bac47da9de08409df1d69664acbb72197.tar.xz
linux-dev-7de3b27bac47da9de08409df1d69664acbb72197.zip
powerpc: Ensure .mem(init|exit).text are within _stext/_etext
In our linker script we open code the list of text sections, because we need to include the __ftr_alt sections, which are arch-specific. This means we can't use TEXT_TEXT as defined in vmlinux.lds.h, and so we don't have the MEM_KEEP() logic for memory hotplug sections. If we build the kernel with the gold linker, and with CONFIG_MEMORY_HOTPLUG=y, we see that functions marked __meminit can end up outside of the _stext/_etext range, and also outside of _sinittext/_einittext, eg: c000000000000000 T _stext c0000000009e0000 A _etext c0000000009e3f18 T hash__vmemmap_create_mapping c000000000ca0000 T _sinittext c000000000d00844 T _einittext This causes them to not be recognised as text by is_kernel_text(), and prevents them being patched by jump_label (and presumably ftrace/kprobes etc.). Fix it by adding MEM_KEEP() directives, mirroring what TEXT_TEXT does. This isn't a problem when CONFIG_MEMORY_HOTPLUG=n, because we use the standard INIT_TEXT_SECTION() and EXIT_TEXT macros from vmlinux.lds.h. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Tested-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to '')
-rw-r--r--arch/powerpc/kernel/vmlinux.lds.S2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index b5fba689fca6..b59d75e194a5 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -56,6 +56,8 @@ SECTIONS
KPROBES_TEXT
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
+ MEM_KEEP(init.text)
+ MEM_KEEP(exit.text)
#ifdef CONFIG_PPC32
*(.got1)