[PATCH 2/7] zsmalloc: prevent mappping in interrupt context
From: Minchan Kim <minchan@kernel.org>
Date: 2012-08-08 06:12:48
Also in:
lkml
Subsystem:
staging subsystem, the rest · Maintainers:
Greg Kroah-Hartman, Linus Torvalds
From: Seth Jennings <redacted> Because we use per-cpu mapping areas shared among the pools/users, we can't allow mapping in interrupt context because it can corrupt another users mappings. Signed-off-by: Seth Jennings <redacted> Signed-off-by: Minchan Kim <minchan@kernel.org> --- drivers/staging/zsmalloc/zsmalloc-main.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c
index 3c83c65..b86133f 100644
--- a/drivers/staging/zsmalloc/zsmalloc-main.c
+++ b/drivers/staging/zsmalloc/zsmalloc-main.c@@ -75,6 +75,7 @@ #include <linux/cpumask.h> #include <linux/cpu.h> #include <linux/vmalloc.h> +#include <linux/hardirq.h> #include "zsmalloc.h" #include "zsmalloc_int.h"
@@ -761,6 +762,13 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle, BUG_ON(!handle); + /* + * Because we use per-cpu mapping areas shared among the + * pools/users, we can't allow mapping in interrupt context + * because it can corrupt another users mappings. + */ + BUG_ON(in_interrupt()); + obj_handle_to_location(handle, &page, &obj_idx); get_zspage_mapping(get_first_page(page), &class_idx, &fg); class = &pool->size_class[class_idx];
--
1.7.9.5
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