[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [PATCH] xen: Drop the (almost) unused extern start[]
On Tue, 25 Jul 2023, Andrew Cooper wrote: > This global variable is shadowed by plenty local variables, violating MISRA > rule 5.3. Some architectures happen to have a symbol by the name of start in > their head.S's, but it's not a useful symbol to reference from C. > > In fact, the single use of the global start[] in RISC-V is wrong and means to > use _start[] as the linker symbol at the beginning of the .text section, not > the function which happens to be in the same location. > > Fix RISC-V to use the right symbol for it's calculation, and drop the extern. > > Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> > --- > CC: Jan Beulich <JBeulich@xxxxxxxx> > CC: Roger Pau Monné <roger.pau@xxxxxxxxxx> > CC: Wei Liu <wl@xxxxxxx> > CC: Stefano Stabellini <sstabellini@xxxxxxxxxx> > CC: Julien Grall <julien@xxxxxxx> > CC: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx> > CC: Bertrand Marquis <bertrand.marquis@xxxxxxx> > CC: Bob Eshleman <bobbyeshleman@xxxxxxxxx> > CC: Alistair Francis <alistair.francis@xxxxxxx> > CC: Connor Davis <connojdavis@xxxxxxxxx> > CC: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx> > CC: Roberto Bagnara <roberto.bagnara@xxxxxxxxxxx> > > I'm expecting: > > https://gitlab.com/xen-project/people/andyhhp/xen/-/pipelines/945105609 > > to come back and show green, but Gitlab is very backed up right now. I've > compiled each architecture locally. > --- > xen/arch/riscv/mm.c | 2 +- > xen/include/xen/kernel.h | 2 +- > 2 files changed, 2 insertions(+), 2 deletions(-) > > diff --git a/xen/arch/riscv/mm.c b/xen/arch/riscv/mm.c > index fddb3cd0bdeb..99ed5e9623cc 100644 > --- a/xen/arch/riscv/mm.c > +++ b/xen/arch/riscv/mm.c > @@ -148,7 +148,7 @@ static bool __init check_pgtbl_mode_support(struct > mmu_desc *mmu_desc, > > unsigned long aligned_load_start = load_start & level_map_mask; > unsigned long aligned_page_size = XEN_PT_LEVEL_SIZE(page_table_level); > - unsigned long xen_size = (unsigned long)(_end - start); > + unsigned long xen_size = (unsigned long)(_end - _start); > > if ( (load_start + xen_size) > (aligned_load_start + aligned_page_size) ) > { > diff --git a/xen/include/xen/kernel.h b/xen/include/xen/kernel.h > index 9ac2694dc7b1..46b3c9c02625 100644 > --- a/xen/include/xen/kernel.h > +++ b/xen/include/xen/kernel.h > @@ -66,7 +66,7 @@ > }) > > /* SAF-0-safe */ > -extern char _start[], _end[], start[]; > +extern char _start[], _end[]; > #define is_kernel(p) ({ \ > char *__p = (char *)(unsigned long)(p); \ > (__p >= _start) && (__p < _end); \ > > base-commit: 0b1171be87698bc7d14760383c0770aeb6e41dd4 > -- > 2.30.2 >
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