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From: kbuild test robot <lkp@intel.com>
To: Arvind Sankar <nivedita@alum.mit.edu>
Cc: kbuild-all@lists.01.org, Ard Biesheuvel <ardb@kernel.org>,
	linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 11/14] efi/gop: Allow specifying mode number on command line
Date: Fri, 20 Mar 2020 09:09:36 +0800
Message-ID: <202003200926.XSqVB2SG%lkp@intel.com> (raw)
In-Reply-To: <20200319192855.29876-12-nivedita@alum.mit.edu>


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Hi Arvind,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on efi/next]
[also build test WARNING on next-20200319]
[cannot apply to linux/master linus/master v5.6-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Arvind-Sankar/efi-gop-Refactoring-mode-setting-feature/20200320-044605
base:   https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git next
config: arm64-defconfig (attached as .config)
compiler: aarch64-linux-gcc (GCC) 9.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=9.2.0 make.cross ARCH=arm64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/firmware/efi/libstub/gop.c: In function 'efi_setup_gop':
>> drivers/firmware/efi/libstub/gop.c:116:21: warning: 'new_mode' may be used uninitialized in this function [-Wmaybe-uninitialized]
     116 |  if (efi_call_proto(gop, set_mode, new_mode) != EFI_SUCCESS)
         |                     ^~~
   drivers/firmware/efi/libstub/gop.c:100:16: note: 'new_mode' was declared here
     100 |  u32 cur_mode, new_mode;
         |                ^~~~~~~~

vim +/new_mode +116 drivers/firmware/efi/libstub/gop.c

    96	
    97	static void set_mode(efi_graphics_output_protocol_t *gop)
    98	{
    99		efi_graphics_output_protocol_mode_t *mode;
   100		u32 cur_mode, new_mode;
   101	
   102		switch (cmdline.option) {
   103		case EFI_CMDLINE_NONE:
   104			return;
   105		case EFI_CMDLINE_MODE_NUM:
   106			new_mode = choose_mode_modenum(gop);
   107			break;
   108		}
   109	
   110		mode = efi_table_attr(gop, mode);
   111		cur_mode = efi_table_attr(mode, mode);
   112	
   113		if (new_mode == cur_mode)
   114			return;
   115	
 > 116		if (efi_call_proto(gop, set_mode, new_mode) != EFI_SUCCESS)
   117			efi_printk("Failed to set requested mode\n");
   118	}
   119	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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  parent reply index

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-19 19:28 [PATCH 00/14] efi/gop: Refactoring + mode-setting feature Arvind Sankar
2020-03-19 19:28 ` [PATCH 01/14] efi/gop: Remove redundant current_fb_base Arvind Sankar
2020-03-19 19:28 ` [PATCH 02/14] efi/gop: Move check for framebuffer before con_out Arvind Sankar
2020-03-19 19:28 ` [PATCH 03/14] efi/gop: Get mode information outside the loop Arvind Sankar
2020-03-19 19:28 ` [PATCH 04/14] efi/gop: Factor out locating the gop into a function Arvind Sankar
2020-03-19 19:28 ` [PATCH 05/14] efi/gop: Slightly re-arrange logic of find_gop Arvind Sankar
2020-03-19 19:28 ` [PATCH 06/14] efi/gop: Move variable declarations into loop block Arvind Sankar
2020-03-19 19:28 ` [PATCH 07/14] efi/gop: Use helper macros for populating lfb_base Arvind Sankar
2020-03-19 19:28 ` [PATCH 08/14] efi/gop: Use helper macros for find_bits Arvind Sankar
2020-03-19 19:28 ` [PATCH 09/14] efi/gop: Remove unreachable code from setup_pixel_info Arvind Sankar
2020-03-19 19:28 ` [PATCH 10/14] efi/gop: Add prototypes for query_mode and set_mode Arvind Sankar
2020-03-19 19:28 ` [PATCH 11/14] efi/gop: Allow specifying mode number on command line Arvind Sankar
2020-03-19 22:53   ` kbuild test robot
2020-03-20  1:09   ` kbuild test robot [this message]
2020-03-20 14:36   ` Dan Carpenter
2020-03-20 17:51     ` Arvind Sankar
2020-03-19 19:28 ` [PATCH 12/14] efi/gop: Allow specifying mode by <xres>x<yres> Arvind Sankar
2020-03-19 19:28 ` [PATCH 13/14] efi/gop: Allow specifying depth as well as resolution Arvind Sankar
2020-03-19 19:28 ` [PATCH 14/14] efi/gop: Allow automatically choosing the best mode Arvind Sankar
2020-03-19 20:02 ` [PATCH 00/14] efi/gop: Refactoring + mode-setting feature Ard Biesheuvel
2020-03-20  2:00 ` [PATCH v2 " Arvind Sankar
2020-03-25 16:41   ` Ard Biesheuvel
2020-03-25 22:10     ` Arvind Sankar
2020-03-25 23:36       ` Ard Biesheuvel
2020-03-26 10:41         ` Ard Biesheuvel
2020-03-28 16:06           ` efi/gop: skip cur_mode in choose_mode_auto Arvind Sankar
2020-03-28 16:06             ` [PATCH v3] efi/gop: Allow automatically choosing the best mode Arvind Sankar
2020-03-29  7:47             ` efi/gop: skip cur_mode in choose_mode_auto Ard Biesheuvel
2020-03-26 23:56         ` [PATCH v2 00/14] efi/gop: Refactoring + mode-setting feature Arvind Sankar
2020-03-28 15:43           ` Ard Biesheuvel
2020-03-25 16:50   ` Hans de Goede
2020-03-25 22:13     ` Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 01/14] efi/gop: Remove redundant current_fb_base Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 02/14] efi/gop: Move check for framebuffer before con_out Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 03/14] efi/gop: Get mode information outside the loop Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 04/14] efi/gop: Factor out locating the gop into a function Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 05/14] efi/gop: Slightly re-arrange logic of find_gop Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 06/14] efi/gop: Move variable declarations into loop block Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 07/14] efi/gop: Use helper macros for populating lfb_base Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 08/14] efi/gop: Use helper macros for find_bits Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 09/14] efi/gop: Remove unreachable code from setup_pixel_info Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 10/14] efi/gop: Add prototypes for query_mode and set_mode Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 11/14] efi/gop: Allow specifying mode number on command line Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 12/14] efi/gop: Allow specifying mode by <xres>x<yres> Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 13/14] efi/gop: Allow specifying depth as well as resolution Arvind Sankar
2020-03-20  2:00 ` [PATCH v2 14/14] efi/gop: Allow automatically choosing the best mode Arvind Sankar

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