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| author |   Helge Deller <deller@gmx.de> | 2019-05-14 21:40:53 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2019-05-20 10:51:39 +0200 |
| commit | 200036a8e802dee09103031eeeaea91dd212ec99 (patch) | |
| tree | eb31041482e465d1cf084d71123b0afa9aeab452 /arch/parisc | |
| parent | parisc: Kconfig: remove ARCH_DISCARD_MEMBLOCK (diff) | |
| download | linux-dev-200036a8e802dee09103031eeeaea91dd212ec99.tar.xz linux-dev-200036a8e802dee09103031eeeaea91dd212ec99.zip | |
parisc: Allow building 64-bit kernel without -mlong-calls compiler option
A 64-bit kernel built without CONFIG_MLONGCALLS (-mlong-calls compiler
option) usually fails to link because of unreachable functions. Try to
work around that linking issue by moving the *.init and *.exit text
segments closer to the main text segment. With that change those
segments now don't get freed at runtime any longer, but since we in most
cases run with huge-page enabled, we ignore the lost memory in
preference of better performance.
This change will not guarantee that every kernel config will now
sucessfully build with short calls and without linking issues.
Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/Kconfig | 3 | ||||
| -rw-r--r-- | arch/parisc/kernel/vmlinux.lds.S | 21 |
2 files changed, 16 insertions, 8 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index 13b9512527c7..4860efa91d7b 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -194,7 +194,8 @@ config PREFETCH config MLONGCALLS bool "Enable the -mlong-calls compiler option for big kernels" - default y + default y if !MODULES || UBSAN || FTRACE + default n depends on PA8X00 help If you configure the kernel to include many drivers built-in instead diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S index c3b1b9c24ede..cd33b4feacb1 100644 --- a/arch/parisc/kernel/vmlinux.lds.S +++ b/arch/parisc/kernel/vmlinux.lds.S @@ -35,6 +35,15 @@ OUTPUT_FORMAT("elf64-hppa-linux") OUTPUT_ARCH(hppa:hppa2.0w) #endif +#define EXIT_TEXT_SECTIONS() .exit.text : { EXIT_TEXT } +#if !defined(CONFIG_64BIT) || defined(CONFIG_MLONGCALLS) +#define MLONGCALL_KEEP(x) +#define MLONGCALL_DISCARD(x) x +#else +#define MLONGCALL_KEEP(x) x +#define MLONGCALL_DISCARD(x) +#endif + ENTRY(parisc_kernel_start) #ifndef CONFIG_64BIT jiffies = jiffies_64 + 4; @@ -47,15 +56,11 @@ SECTIONS __init_begin = .; HEAD_TEXT_SECTION - INIT_TEXT_SECTION(8) + MLONGCALL_DISCARD(INIT_TEXT_SECTION(8)) . = ALIGN(PAGE_SIZE); INIT_DATA_SECTION(PAGE_SIZE) - /* we have to discard exit text and such at runtime, not link time */ - .exit.text : - { - EXIT_TEXT - } + MLONGCALL_DISCARD(EXIT_TEXT_SECTIONS()) .exit.data : { EXIT_DATA @@ -73,11 +78,12 @@ SECTIONS _text = .; /* Text and read-only data */ _stext = .; + MLONGCALL_KEEP(INIT_TEXT_SECTION(8)) .text ALIGN(PAGE_SIZE) : { TEXT_TEXT + LOCK_TEXT SCHED_TEXT CPUIDLE_TEXT - LOCK_TEXT KPROBES_TEXT IRQENTRY_TEXT SOFTIRQENTRY_TEXT @@ -92,6 +98,7 @@ SECTIONS *(.lock.text) /* out-of-line lock text */ *(.gnu.warning) } + MLONGCALL_KEEP(EXIT_TEXT_SECTIONS()) . = ALIGN(PAGE_SIZE); _etext = .; /* End of text section */ |