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kernel: ashmem: use kallsyms_lookup_name for internal symbol access

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This commit is contained in:
Simon Fels 2016-12-06 08:16:32 +01:00
commit f2110223d1
3 changed files with 6 additions and 27 deletions
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10
kernel/ashmem/Makefile
View file

@ -1,14 +1,7 @@
ccflags-y += -I$(src) -Wno-error=implicit-int
ifneq ($(KERNELRELEASE),)
ccflags-y += -I$(src) -Wno-error=implicit-int -Wno-int-conversion
obj-m := ashmem_linux.o
ashmem_linux-y := deps.o ashmem.o
$(obj)/deps.o: $(src)/deps.h
$(obj)/deps.h: $(src)/gen_deps.sh
sudo $(src)/gen_deps.sh > $@
else
KERNEL_SRC ?= /lib/modules/$(shell uname -r)/build
all:
@ -19,4 +12,3 @@ install:
clean:
rm -rf deps.h *.o *.ko *.mod.c *.symvers *.order .*.cmd .tmp_versions
endif

9
kernel/ashmem/deps.c
View file

@ -1,10 +1,11 @@
#include <linux/mm.h>
#include <linux/kallsyms.h>
#include "deps.h"
static int (*shmem_zero_setup_ptr)(struct vm_area_struct *) = SHMEM_ZERO_SETUP;
static int (*shmem_zero_setup_ptr)(struct vm_area_struct *) = NULL;
int shmem_zero_setup(struct vm_area_struct *vma)
{
return shmem_zero_setup_ptr(vma);
if (!shmem_zero_setup_ptr)
shmem_zero_setup_ptr = kallsyms_lookup_name("shmem_zero_setup");
return shmem_zero_setup_ptr(vma);
}

14
kernel/ashmem/gen_deps.sh
View file

@ -1,14 +0,0 @@
#!/bin/sh
SYMS="shmem_zero_setup"
for sym in $SYMS; do
addr=`cat /proc/kallsyms | grep -Ee '^[0-9a-f]+ T '$sym'$' | sed -e 's/\s.*$//g'`
if [ a$addr = 'a' ]; then
echo "Error: can't find symbol $sym"
exit 1
fi
name=`echo $sym | tr '[:lower:]' '[:upper:]'`
echo "#define $name\t(void *)0x$addr"
done