Hello Nathan, Thank you for your response. We have submitted 2 separate PRs as recommended by you to resolve warnings 6 (#1695) and 8 (#1702).
About warnings 1 to 4, we understand that casting away the 'volatile' type qualifier of a variable should be avoided if possible. Can we consider modifying the prototype of the function up_copystate() in up_internal.h file, from: void up_copystate(uint32_t *dest, uint32_t *src); to: void up_copystate(uint32_t *dest, volatile uint32_t *src); in order to resolve this warning. We have tried the above fix in our local repository and checked build. We found that warnings 1 to 4 are resolved, however, it generates a new warning in file: arch/renesas/src/rx65n/rx65n_copystate.c: passing argument 2 of ‘up_copystate’ discards ‘volatile’ qualifier from pointer target type memcpy(dest, src, XCPTCONTEXT_SIZE); expected ‘const void *’ but argument is of type ‘volatile uint32_t *’ FAR void *memcpy(FAR void *dest, FAR const void *src, size_t n); This can be resolved by typecasting the variables when calling memcpy() alone. As these files are common to other Renesas architectures as well, please confirm if the above modifications are okay. Regards, Bhindhiya Raja ________________________________ From: Nathan Hartman <hartman.nat...@gmail.com> Sent: Tuesday, September 1, 2020 6:32 PM To: dev@nuttx.apache.org <dev@nuttx.apache.org> Subject: Re: Warnings in Renesas common files ________________________________ **This is an external email. Please check the sender’s full email address (not just the sender name) and exercise caution before you respond or click any embedded link/attachment.** ________________________________ On Tue, Sep 1, 2020 at 8:12 AM Bhindhiya Raja <bhindhiy...@tataelxsi.co.in.invalid> wrote: > Hello Team, > > We are working on adding pre-check support for Renesas RX65N MCU. We are > getting the below warnings in the common files used across the Renesas MCUs > (M16, SH1 and RX65N). > > > 1. arch/renesas/src/common/up_blocktask.c: passing argument 2 of > ‘up_copystate’ discards ‘volatile’ qualifier from pointer target type > 2. arch/renesas/src/common/up_releasepending.c: passing argument 2 of > ‘up_copystate’ discards ‘volatile’ qualifier from pointer target type > 3. arch/renesas/src/common/up_reprioritizertr.c: passing argument 2 of > ‘up_copystate’ discards ‘volatile’ qualifier from pointer target type > 4. arch/renesas/src/common/up_unblocktask.c: passing argument 2 of > ‘up_copystate’ discards ‘volatile’ qualifier from pointer target type > 5. arch/renesas/src/common/up_doirq.c: assignment discards ‘volatile’ > qualifier from pointer target type > 6. arch/renesas/src/common/up_initialize.c: implicit declaration of > function ‘up_serialinit’ > 7. arch/renesas/src/common/up_usestack.c: assignment makes pointer from > integer without a cast > 8. net/mld/mld_group.c: label ‘errout_with_sem’ defined but not used > > The following modifications would resolve the above mentioned warnings. > > Warnings 1, 2, 3 and 4 mentioned above can be resolved by typecasting the > argument 2 of ‘up_copystate’ to the type of the actual parameter while > invoking the function as follows: > up_copystate(rtcb->xcp.regs, (uint32_t *)up_current_regs); > > Warning 5 can be resolved similarly by typecasting the variable upon > assignment as follows: > regs = (uint32_t *)g_current_regs; Should we cast away the volatile modifier or is this something that should be looked into? (i.e., should those functions be modified to take a volatile uint32_t *?) Warning 6 can be resolved by including the function declaration for > up_serialinit() in the header file up_internal.h. Warning 7 can be resolved by typecasting the variable top_of_stack to (void > *) as follows: > tcb->adj_stack_ptr = (void *)top_of_stack; > > Warning 8 can be resolved by removing the label 'errout_with_sem' as it is > simply defined but not used anywhere in the function. I will need to examine the code to be sure (I'm replying on my phone now) but the fix for 6 and 8 sounds reasonable. Unless these warnings are cleared, RX65N cannot be added to the pre-check > since due to the [-Werror] flag, the build fails. > As the above mentioned files are common files to m16 and sh1 architectures > also, can you confirm whether the above modifications are okay. I recommend to submit separate PRs for fixes 6 and 8. But I think the use of volatile modifiers needs to be looked at more closely. I prefer not to cast away volatile-ness unless no other choice. Also not sure about 7. Cheers, Nathan ________________________________ Disclaimer: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you are not the intended recipient of this message , or if this message has been addressed to you in error, please immediately alert the sender by reply email and then delete this message and any attachments. If you are not the intended recipient, you are hereby notified that any use, dissemination, copying, or storage of this message or its attachments is strictly prohibited. Email transmission cannot be guaranteed to be secure or error-free, as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. 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