linux-kernel - [PATCH v2] hpet: Fix missing '=' character in the __setup() code of hpet_mmap

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Date:   Thu, 20 Dec 2018 17:35:24 +0530
From:   Buland Singh <bsingh@...hat.com>
To:     clemens@...isch.de
Cc:     gregkh@...uxfoundation.org, arnd@...db.de,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: [PATCH v2] hpet: Fix missing '=' character in the __setup() code of hpet_mmap_enable

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@...hat.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