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authorChen Gang <xili_gchen_5257@hotmail.com>2015-08-06 00:34:53 +0200
committerJesper Nilsson <jespern@axis.com>2015-11-02 20:03:04 +0100
commitc33fe4444395a6972b30cb91676d04af2a3dc1a5 (patch)
tree6ad372d9dfb4a773ebbfdcd1fcb63103e8d3e5a4 /arch/cris
parent8f40dcebefd4a9e8fa24d2ac5e3fd5e410eea58d (diff)
downloadlinux-c33fe4444395a6972b30cb91676d04af2a3dc1a5.tar.bz2
cris: arch-v10: kgdb: Add '__used' for static variable is_dyn_brkp
Within one C file, current gcc can optimize the global static variables according to the C code, but it will skip assembly code -- it will pass them to gas directly. if the static variable is used between C code and assembly code in one C file (e.g. is_dyn_brkp in kgdb.c), it needs '__used' to let gcc know it should be still used, or gcc may remove it for optimization. The related error in this case: LD init/built-in.o arch/cris/arch-v10/kernel/built-in.o: In function `kgdb_handle_breakpoint': (.text+0x2aca): undefined reference to `is_dyn_brkp' arch/cris/arch-v10/kernel/built-in.o: In function `is_static': kgdb.c:(.text+0x2ada): undefined reference to `is_dyn_brkp' Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Signed-off-by: Jesper Nilsson <jespern@axis.com>
Diffstat (limited to 'arch/cris')
-rw-r--r--arch/cris/arch-v10/kernel/kgdb.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/cris/arch-v10/kernel/kgdb.c b/arch/cris/arch-v10/kernel/kgdb.c
index 3b92c5c8fe58..ed71ade93a73 100644
--- a/arch/cris/arch-v10/kernel/kgdb.c
+++ b/arch/cris/arch-v10/kernel/kgdb.c
@@ -352,7 +352,7 @@ char internal_stack[INTERNAL_STACK_SIZE];
breakpoint to be handled. A static breakpoint uses the content of register
BRP as it is whereas a dynamic breakpoint requires subtraction with 2
in order to execute the instruction. The first breakpoint is static. */
-static unsigned char is_dyn_brkp = 0;
+static unsigned char __used is_dyn_brkp;
/********************************* String library ****************************/
/* Single-step over library functions creates trap loops. */