linux-kernel - [PATCH v2] MIPS: vpe-mt: drop physical

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Date:   Sun, 19 Feb 2023 15:15:25 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        kernel test robot <lkp@...el.com>,
        Dengcheng Zhu <dzhu@...ecomp.com>,
        John Crispin <john@...ozen.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Philippe Mathieu-Daudé <philmd@...aro.org>,
        "Steven J. Hill" <Steven.Hill@...tec.com>,
        Qais Yousef <Qais.Yousef@...tec.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        James Hogan <jhogan@...nel.org>, linux-mips@...r.kernel.org
Subject: [PATCH v2] MIPS: vpe-mt: drop physical_memsize

When neither LANTIQ nor MIPS_MALTA is set, 'physical_memsize' is not
declared. This causes the build to fail with:

mips-linux-ld: arch/mips/kernel/vpe-mt.o: in function `vpe_run':
arch/mips/kernel/vpe-mt.c:(.text.vpe_run+0x280): undefined reference to `physical_memsize'

LANTIQ is not using 'physical_memsize' and MIPS_MALTA's use of it is
self-contained in mti-malta/malta-dtshim.c.
Use of physical_memsize in vpe-mt.c appears to be unused, so eliminate
this loader mode completely and require VPE programs to be compiled with
DFLT_STACK_SIZE and DFLT_HEAP_SIZE defined.

Fixes: 9050d50e2244 ("MIPS: lantiq: Set physical_memsize")
Fixes: 1a2a6d7e8816 ("MIPS: APRP: Split VPE loader into separate files.")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: kernel test robot <lkp@...el.com>
Link: https://lore.kernel.org/all/202302030625.2g3E98sY-lkp@intel.com/
Cc: Dengcheng Zhu <dzhu@...ecomp.com>
Cc: John Crispin <john@...ozen.org>
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Philippe Mathieu-Daudé <philmd@...aro.org>
Cc: "Steven J. Hill" <Steven.Hill@...tec.com>
Cc: Qais Yousef <Qais.Yousef@...tec.com>
Cc: Yang Yingliang <yangyingliang@...wei.com>
Cc: Hauke Mehrtens <hauke@...ke-m.de>
Cc: James Hogan <jhogan@...nel.org>
Cc: linux-mips@...r.kernel.org
---
v2 changes: instead of providing a default physical_memsize of 0, which
    is not correct for MIPS_MALTA, just eliminate its use in vpe-mt.c.

 arch/mips/include/asm/vpe.h |    1 -
 arch/mips/kernel/vpe-mt.c   |    7 +++----
 arch/mips/lantiq/prom.c     |    6 ------
 3 files changed, 3 insertions(+), 11 deletions(-)

diff -- a/arch/mips/lantiq/prom.c b/arch/mips/lantiq/prom.c
--- a/arch/mips/lantiq/prom.c
+++ b/arch/mips/lantiq/prom.c
@@ -23,12 +23,6 @@ DEFINE_SPINLOCK(ebu_lock);
 EXPORT_SYMBOL_GPL(ebu_lock);
 
 /*
- * This is needed by the VPE loader code, just set it to 0 and assume
- * that the firmware hardcodes this value to something useful.
- */
-unsigned long physical_memsize = 0L;
-
-/*
  * this struct is filled by the soc specific detection code and holds
  * information about the specific soc type, revision and name
  */
diff -- a/arch/mips/include/asm/vpe.h b/arch/mips/include/asm/vpe.h
--- a/arch/mips/include/asm/vpe.h
+++ b/arch/mips/include/asm/vpe.h
@@ -102,7 +102,6 @@ struct vpe_control {
 	struct list_head tc_list;       /* Thread contexts */
 };
 
-extern unsigned long physical_memsize;
 extern struct vpe_control vpecontrol;
 extern const struct file_operations vpe_fops;
 
diff -- a/arch/mips/kernel/vpe-mt.c b/arch/mips/kernel/vpe-mt.c
--- a/arch/mips/kernel/vpe-mt.c
+++ b/arch/mips/kernel/vpe-mt.c
@@ -92,12 +92,11 @@ int vpe_run(struct vpe *v)
 	write_tc_c0_tchalt(read_tc_c0_tchalt() & ~TCHALT_H);
 
 	/*
-	 * The sde-kit passes 'memsize' to __start in $a3, so set something
-	 * here...  Or set $a3 to zero and define DFLT_STACK_SIZE and
-	 * DFLT_HEAP_SIZE when you compile your program
+	 * We don't pass the memsize here, so VPE programs need to be
+	 * compiled with DFLT_STACK_SIZE and DFLT_HEAP_SIZE defined.
 	 */
+	mttgpr(7, 0);
 	mttgpr(6, v->ntcs);
-	mttgpr(7, physical_memsize);
 
 	/* set up VPE1 */
 	/*