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authorHelge Deller <deller@gmx.de>2014-04-30 23:26:02 +0200
committerJames Hogan <james.hogan@imgtec.com>2014-05-15 00:01:41 +0100
commit042d27acb64924a0e8a43e972485913a32407beb (patch)
tree0a0d7f6bc2fcf5dd1e12b7da481c22464fa3e859 /arch/metag
parentd71f290b4e98a39f49f2595a13be3b4d5ce8e1f1 (diff)
downloadlinux-042d27acb64924a0e8a43e972485913a32407beb.tar.gz
parisc,metag: Do not hardcode maximum userspace stack size
This patch affects only architectures where the stack grows upwards (currently parisc and metag only). On those do not hardcode the maximum initial stack size to 1GB for 32-bit processes, but make it configurable via a config option. The main problem with the hardcoded stack size is, that we have two memory regions which grow upwards: stack and heap. To keep most of the memory available for heap in a flexmap memory layout, it makes no sense to hard allocate up to 1GB of the memory for stack which can't be used as heap then. This patch makes the stack size for 32-bit processes configurable and uses 80MB as default value which has been in use during the last few years on parisc and which hasn't showed any problems yet. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: linux-parisc@vger.kernel.org Cc: linux-metag@vger.kernel.org Cc: John David Anglin <dave.anglin@bell.net>
Diffstat (limited to 'arch/metag')
-rw-r--r--arch/metag/include/asm/processor.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/metag/include/asm/processor.h b/arch/metag/include/asm/processor.h
index 3be8581af49..a8a37477c66 100644
--- a/arch/metag/include/asm/processor.h
+++ b/arch/metag/include/asm/processor.h
@@ -23,7 +23,7 @@
#define STACK_TOP (TASK_SIZE - PAGE_SIZE)
#define STACK_TOP_MAX STACK_TOP
/* Maximum virtual space for stack */
-#define STACK_SIZE_MAX (1 << 28) /* 256 MB */
+#define STACK_SIZE_MAX (CONFIG_MAX_STACK_SIZE_MB*1024*1024)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.