Messages in this thread Patch in this message | | | Subject | [PATCH] Reduce stack used by lib/hexdump.c | From | Joe Perches <> | Date | Thu, 29 Nov 2007 12:57:53 -0800 |
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200 bytes on stack might be a bit much.
Size goes up to text data bss dec hex filename 1142 0 0 1142 476 lib/hexdump.o Without the WARN_ON 1053 0 0 1053 41d lib/hexdump.o Before this patch 1004 0 0 1004 3ec lib/hexdump.o
Win some/lose some...
Signed-off-by: Joe Perches <joe@perches.com>
diff --git a/lib/hexdump.c b/lib/hexdump.c index 70e23fb..be94934 100644 --- a/lib/hexdump.c +++ b/lib/hexdump.c @@ -140,13 +140,20 @@ EXPORT_SYMBOL(hex_dump_to_buffer); * Example output using %DUMP_PREFIX_ADDRESS and 4-byte mode: * ffffffff88089af0: 73727170 77767574 7b7a7978 7f7e7d7c pqrstuvwxyz{|}~. */ + +#define HEX_LINE_SIZE 200 + void print_hex_dump(const char *level, const char *prefix_str, int prefix_type, int rowsize, int groupsize, const void *buf, size_t len, bool ascii) { const u8 *ptr = buf; int i, linelen, remaining = len; - unsigned char linebuf[200]; + unsigned char *linebuf; + + linebuf = kmalloc(HEX_LINE_SIZE, GFP_KERNEL); + if (!linebuf) { + WARN_ON(1); + return; + } if (rowsize != 16 && rowsize != 32) rowsize = 16; @@ -155,7 +162,7 @@ void print_hex_dump(const char *level, const char *prefix_str, int prefix_type, linelen = min(remaining, rowsize); remaining -= rowsize; hex_dump_to_buffer(ptr + i, linelen, rowsize, groupsize, - linebuf, sizeof(linebuf), ascii); + linebuf, HEX_LINE_SIZE, ascii); switch (prefix_type) { case DUMP_PREFIX_ADDRESS: @@ -170,6 +177,7 @@ void print_hex_dump(const char *level, const char *prefix_str, int prefix_type, break; } } + kfree(linebuf); } EXPORT_SYMBOL(print_hex_dump);
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