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Subject[PATCH, RFC] kill odd mm context pinning hack in frv
David, is that more than a debugging aid?   I'm trying to get rid of
tasklist_lock users and this one looks really suspicios..


Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: linux-2.6/arch/frv/kernel/sysctl.c
===================================================================
--- linux-2.6.orig/arch/frv/kernel/sysctl.c 2005-08-11 16:45:53.000000000 +0200
+++ linux-2.6/arch/frv/kernel/sysctl.c 2005-08-11 19:17:24.000000000 +0200
@@ -117,69 +117,12 @@

} /* end procctl_frv_cachemode() */

-/*****************************************************************************/
-/*
- * permit the mm_struct the nominated process is using have its MMU context ID pinned
- */
-#ifdef CONFIG_MMU
-static int procctl_frv_pin_cxnr(ctl_table *table, int write, struct file *filp,
- void *buffer, size_t *lenp, loff_t *ppos)
-{
- pid_t pid;
- char buff[16], *p;
- int len;
-
- len = *lenp;
-
- if (write) {
- /* potential state change */
- if (len <= 1 || len > sizeof(buff) - 1)
- return -EINVAL;
-
- if (copy_from_user(buff, buffer, len) != 0)
- return -EFAULT;
-
- if (buff[len - 1] == '\n')
- buff[len - 1] = '\0';
- else
- buff[len] = '\0';
-
- pid = simple_strtoul(buff, &p, 10);
- if (*p)
- return -EINVAL;
-
- return cxn_pin_by_pid(pid);
- }
-
- /* read the currently pinned CXN */
- if (filp->f_pos > 0) {
- *lenp = 0;
- return 0;
- }
-
- len = snprintf(buff, sizeof(buff), "%d\n", cxn_pinned);
- if (len > *lenp)
- len = *lenp;
-
- if (copy_to_user(buffer, buff, len) != 0)
- return -EFAULT;
-
- *lenp = len;
- filp->f_pos = len;
- return 0;
-
-} /* end procctl_frv_pin_cxnr() */
-#endif
-
/*
* FR-V specific sysctls
*/
static struct ctl_table frv_table[] =
{
{ 1, "cache-mode", NULL, 0, 0644, NULL, &procctl_frv_cachemode },
-#ifdef CONFIG_MMU
- { 2, "pin-cxnr", NULL, 0, 0644, NULL, &procctl_frv_pin_cxnr },
-#endif
{ 0 }
};

Index: linux-2.6/include/asm-frv/mmu.h
===================================================================
--- linux-2.6.orig/include/asm-frv/mmu.h 2005-08-11 16:46:04.000000000 +0200
+++ linux-2.6/include/asm-frv/mmu.h 2005-08-11 19:18:10.000000000 +0200
@@ -34,9 +34,4 @@

} mm_context_t;

-#ifdef CONFIG_MMU
-extern int __nongpreldata cxn_pinned;
-extern int cxn_pin_by_pid(pid_t pid);
-#endif
-
#endif /* _ASM_MMU_H */
-
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