From: Buland Singh <bsingh@redhat.com>
To: clemens@ladisch.de
Cc: gregkh@linuxfoundation.org, arnd@arndb.de,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH v2] hpet: Fix missing '=' character in the __setup() code of hpet_mmap_enable
Date: Thu, 20 Dec 2018 17:35:24 +0530 [thread overview]
Message-ID: <20181220120524.30732-1-bsingh@redhat.com> (raw)
Commit '3d035f580699 ("drivers/char/hpet.c: allow user controlled mmap for
user processes")' introduced a new kernel command line parameter hpet_mmap,
that is required to expose the memory map of the HPET registers to
user-space. Unfortunately the kernel command line parameter 'hpet_mmap' is
broken and never takes effect due to missing '=' character in the __setup()
code of hpet_mmap_enable.
Before this patch:
dmesg output with the kernel command line parameter hpet_mmap=1
[ 0.204152] HPET mmap disabled
dmesg output with the kernel command line parameter hpet_mmap=0
[ 0.204192] HPET mmap disabled
After this patch:
dmesg output with the kernel command line parameter hpet_mmap=1
[ 0.203945] HPET mmap enabled
dmesg output with the kernel command line parameter hpet_mmap=0
[ 0.204652] HPET mmap disabled
Fixes: 3d035f580699 ("drivers/char/hpet.c: allow user controlled mmap for user processes")
Signed-off-by: Buland Singh <bsingh@redhat.com>
---
drivers/char/hpet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index 4a22b4b41aef..9bffcd37cc7b 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -377,7 +377,7 @@ static __init int hpet_mmap_enable(char *str)
pr_info("HPET mmap %s\n", hpet_mmap_enabled ? "enabled" : "disabled");
return 1;
}
-__setup("hpet_mmap", hpet_mmap_enable);
+__setup("hpet_mmap=", hpet_mmap_enable);
static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
{
--
2.19.1
next reply other threads:[~2018-12-20 12:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-20 12:05 Buland Singh [this message]
2018-12-20 12:29 ` [PATCH v2] hpet: Fix missing '=' character in the __setup() code of hpet_mmap_enable Greg KH
2018-12-20 13:42 ` Buland Singh
2018-12-20 14:09 ` Greg KH
2018-12-21 12:18 ` Buland Singh
2018-12-21 12:46 ` Greg KH
2019-01-06 14:09 ` Buland Singh
2019-01-07 12:34 ` Prarit Bhargava
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