On Mon, May 01, 2023 at 09:33:25AM +0200, Alexandre Ghiti wrote: > Hi Palmer, > > On 4/30/23 00:43, Palmer Dabbelt wrote: > > This triggers a -Wdeclaration-after-statement as the code has changed a > > bit since upstream. It might be better to hoist the whole block up, but > > this is a smaller change so I went with it. > > > > arch/riscv/mm/init.c:755:16: warning: mixing declarations and code is a C99 extension [-Wdeclaration-after-statement] > > unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT)); > > ^ > > 1 warning generated. > > > > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > Link: https://lore.kernel.org/oe-kbuild-all/202304300429.SXZOA5up-lkp@xxxxxxxxx/ > > Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx> > > --- > > I haven't even build tested this one, but it looks simple enough that I figured > > I'd just send it. Be warned, though: I broke glibc and missed a merged > > conflict yesterday... > > --- > > arch/riscv/mm/init.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c > > index e800d7981e99..8d67f43f1865 100644 > > --- a/arch/riscv/mm/init.c > > +++ b/arch/riscv/mm/init.c > > @@ -717,6 +717,7 @@ static void __init setup_vm_final(void) > > uintptr_t va, map_size; > > phys_addr_t pa, start, end; > > u64 i; > > + unsigned long idx; > > /** > > * MMU is enabled at this point. But page table setup is not complete yet. > > @@ -735,7 +736,7 @@ static void __init setup_vm_final(void) > > * directly in swapper_pg_dir in addition to the pgd entry that points > > * to fixmap_pte. > > */ > > - unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT)); > > + idx = pgd_index(__fix_to_virt(FIX_FDT)); > > set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]); > > #endif > > The above results to in rv64: > > ../arch/riscv/mm/init.c: In function ‘setup_vm_final’: > ../arch/riscv/mm/init.c:720:16: warning: unused variable ‘idx’ > [-Wunused-variable] > 720 | unsigned long idx; > > > The following fixes this warning: > > > diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c > index 8d67f43f1865..e69d82d573f1 100644 > --- a/arch/riscv/mm/init.c > +++ b/arch/riscv/mm/init.c > @@ -717,7 +717,7 @@ static void __init setup_vm_final(void) > uintptr_t va, map_size; > phys_addr_t pa, start, end; > u64 i; > - unsigned long idx; > + unsigned long idx __maybe_unused; > > /** > * MMU is enabled at this point. But page table setup is not > complete yet. > > > Let me know if you want me to send a proper patch as I'm the one to blame > here. As the original fix here will not work, a "correct" one might be best to have :) thanks, greg k-h
