xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Förgrening 0
Kod Ärenden Pull-förfrågningar Actions Packages Projekt Släpp Wiki Aktiviteter

parisc: fix kernel memory layout in vmlinux.ld.S

Bläddra i källkod 
When building a 64bit kernel sometimes functions in the .init section were not
able to reach the standard kernel function. Main reason for this problem is,
that the linkage tables (.plt, .opd, .dlt) tend to become pretty huge and thus
the distance gets too big for short calls.

One option to avoid this is to use the -mlong-calls compiler option, but this
increases the binary size and introduces a performance penalty.

Instead, with this patch we just lay out the binary differently.  Init code is
stored first, followed by text, R/O and finally R/W data. This means, that init
and text code is now much closer to each other, which is sufficient to reach
each other by short calls.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
2013-11-30 22:07:51 +01:00
förälder c790b41bac
incheckning 161bd3bf60
3 ändrade filer med 78 tillägg och 85 borttagningar
Download Patch File Download Diff File Expand all files Collapse all files

19
arch/parisc/mm/init.c
Visa fil

@@ -32,6 +32,7 @@
#include <asm/sections.h>
extern int data_start;
extern void parisc_kernel_start(void); /* Kernel entry point in head.S */
#if PT_NLEVELS == 3
/* NOTE: This layout exactly conforms to the hybrid L2/L3 page table layout
@@ -324,8 +325,9 @@ static void __init setup_bootmem(void)
reserve_bootmem_node(NODE_DATA(0), 0UL,
(unsigned long)(PAGE0->mem_free +
PDC_CONSOLE_IO_IODC_SIZE), BOOTMEM_DEFAULT);
reserve_bootmem_node(NODE_DATA(0), __pa((unsigned long)_text),
(unsigned long)(_end - _text), BOOTMEM_DEFAULT);
reserve_bootmem_node(NODE_DATA(0), __pa(KERNEL_BINARY_TEXT_START),
(unsigned long)(_end - KERNEL_BINARY_TEXT_START),
BOOTMEM_DEFAULT);
reserve_bootmem_node(NODE_DATA(0), (bootmap_start_pfn << PAGE_SHIFT),
((bootmap_pfn - bootmap_start_pfn) << PAGE_SHIFT),
BOOTMEM_DEFAULT);
@@ -378,6 +380,17 @@ static void __init setup_bootmem(void)
request_resource(&sysram_resources[0], &pdcdata_resource);
}
static int __init parisc_text_address(unsigned long vaddr)
{
static unsigned long head_ptr __initdata;
if (!head_ptr)
head_ptr = PAGE_MASK & (unsigned long)
dereference_function_descriptor(&parisc_kernel_start);
return core_kernel_text(vaddr) || vaddr == head_ptr;
}
static void __init map_pages(unsigned long start_vaddr,
unsigned long start_paddr, unsigned long size,
pgprot_t pgprot, int force)
@@ -466,7 +479,7 @@ static void __init map_pages(unsigned long start_vaddr,
*/
if (force)
pte = __mk_pte(address, pgprot);
else if (core_kernel_text(vaddr) &&
else if (parisc_text_address(vaddr) &&
address != fv_addr)
pte = __mk_pte(address, PAGE_KERNEL_EXEC);
else